We went up a load range on our coach when we had it I felt the coach handled much better. I went up in tire pressure about 10 psi, but not to the max. for the new tire and the ride may have been slightly more firm, but it was worth the trade off as it handled better...seemed to track better with less sway. The tires were also cheaper because they are used on delivery trucks and I guess they make more of them. We went from a 245/70R19.5 F to a Bridgestone R 250, 245/70R19.5 G and they were $60.00 a tire less for the G than the F. You don't need to run them at higher pressure if you don't want to, but you must not exceed the psi rating of the rim. We had steel rims with SS simulators, so pressure was not an issue. It can be with aluminum.